JP7321754B2 - portable cutting machine - Google Patents

Description

The present invention relates to a portable cutting machine powered by a rechargeable battery pack.

The following patent document discloses a technology related to a portable cutting machine to which a battery pack can be attached as a power source. This cutting machine is also called a so-called portable circular saw. With the rectangular base in contact with the upper surface of the material to be cut, the handle portion is gripped and moved forward to protrude from the lower surface of the base. Cutting can be performed by cutting a circular cutting tool into the material to be cut.

As disclosed in the following patent documents, conventional cutting machines of this type have a battery pack attachment portion set in a space extending downward from the rear portion of the handle portion. Conventionally, by effectively utilizing this lower space, a battery pack can be attached without hindering the compactness of the cutting machine.

Japanese Unexamined Patent Application Publication No. 2010-201598 JP 2014-79812 A

However, in the conventional battery mounting structure, there is a limit to the size of the battery that can be mounted in the lower space on the rear side of the handle, and there is a problem that it cannot be applied to larger battery packs that have started to spread in recent years. Larger battery packs tend to interfere with the base, but if the handle is set high to avoid interference with the base, the gripping height will be higher and the operator will be able to move away from the cutting site, making it easier to operate during cutting work. is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to allow a larger battery pack to be attached to the rear portion of the handle without increasing the height of the handle.

According to one feature of the present disclosure, a portable cutting machine includes a base that abuts against a material to be cut, and a cutting machine body that is supported on the upper surface of the base. It is equipped with a configuration for cutting into the material to be cut. The cutting machine main body includes an electric motor as a driving source for operating the cutting tool, and a handle portion to be gripped by the user. The battery pack has a configuration in which the battery pack can be slid and attached to the battery attachment part with the connection surface facing sideways (sideways attitude).

Therefore, since the battery pack having the connection surface on the upper surface is attached to the side portion of the handle portion with the connection surface facing sideways, the battery pack has a large height dimension (side projection dimension in the attached state). The pack can be attached without increasing the position of the handle in the height direction. That is, since the battery pack is attached with the connecting surface facing sideways, the height dimension in the attached state is the dimension of the lateral projection from the handle portion. As a result, the height position of the handle portion can be configured so as not to be affected by the height dimension of the battery pack. As a result, a large battery pack can be attached without securing a large mounting space directly below the handle as in the conventional case, and the degree of freedom in setting the position of the handle in the vertical direction is increased.

According to another feature of the present disclosure, the motor housing that houses the electric motor is provided so as to protrude laterally from the side of the handle portion opposite to the cutting tool. Two types of battery packs with different height dimensions can be interchangeably attached to the battery attachment portion, and both battery packs can be attached within a range not exceeding the end of the motor housing on the side opposite to the cutting tool.

Therefore, two types of battery packs with different height dimensions are exchanged and mounted with the connection surface facing sideways, while the mounted battery pack protrudes from the end of the motor housing on the side opposite to the cutting tool. Since the portable cutting machine can be attached within a range where it does not move, the compactness of the portable cutting machine in the horizontal direction (left-right direction) is not impaired.

According to another feature of the present disclosure, the battery pack is mounted in a range lower in height than the upper edge of the cover that covers the cutting tool.

Therefore, since the battery pack is mounted within a range not exceeding the upper edge of the cover covering the cutting tool, the compactness of the portable cutting machine in the vertical direction is not impaired, and the operation of the portable cutting machine is improved. No loss of sexuality.

According to another feature of the present disclosure, the battery pack is mounted below the grip portion of the handle portion in terms of height.

Therefore, the battery pack does not get in the way when the gripping portion is gripped, and the battery pack does not get in the way when it is gripped.

According to another feature of the present disclosure, the battery pack is mounted with its rearward end positioned rearwardly of the rearward end of the handle portion with respect to the longitudinal position.

Therefore, a large battery pack can be attached by effectively utilizing the empty space behind the handle.

According to another feature of the present disclosure, the battery pack is attached to the battery mount by sliding it in a forward tilting direction downward toward the front where the cutting progresses.

Therefore, it is possible to improve the operability of the sliding operation when the battery is attached or removed by the user positioned behind the handle portion.

According to another feature of the present disclosure, a controller for controlling the operation of the electric motor is positioned in front of the motor housing that houses the electric motor.

Therefore, the dead space in front of the motor housing can be used to compactly arrange the controller.

According to another feature of the present disclosure, the controller is housed in the controller housing in a forward tilted position with the lower side displaced forward. The top of the controller housing is connected to the motor housing.

Therefore, the rigidity of the controller housing is enhanced while suppressing the height dimension of the controller housing.

According to another feature of the present disclosure, an electrical material receiving portion is provided in front of the controller housing with an upper portion lower than the height of the controller housing.

Therefore, it is possible to compactly arrange the electric material accommodating portion by utilizing the empty space.

According to another feature of the present disclosure, the non-tool end of the controller housing is flush with the non-tool end of the motor housing.

Therefore, the end of the controller housing and the end of the motor housing can be grounded, and the portable cutting machine can be stably installed with the cutting tool side facing upward. Work convenience can be achieved.

According to another feature of the present disclosure, the controller housing is provided with a ground surface that allows the portable cutting machine to be installed in an inverted position at three locations, the base, the handle portion, and the controller housing.

Therefore, the portable cutting machine can be stably installed in a three-point inverted posture with the lower surface of the base facing upward, thereby preventing the installation surface from being damaged during a temporary interruption of work. The portable cutting machine can be kept waiting on the installation surface.

It is the whole right side of the portable cutting machine which concerns on 1st Embodiment of this invention. Fig. 2 is an overall plan view of the portable cutting machine according to the first embodiment, viewed from the direction of arrow (II) in Fig. 1; Fig. 2 is an overall front view of the portable cutting machine according to the first embodiment, viewed from the direction of arrow (III) in Fig. 1; Fig. 4 is an overall left side view of the portable cutting machine according to the first embodiment, viewed from the direction of arrow (IV) in Fig. 3; 1. It is the whole rear view which looked at the portable cutting machine which concerns on 1st Embodiment from the arrow (V) direction in FIG. 1 is an overall right side view of a portable cutting machine according to a first embodiment; FIG. This figure shows a state in which the cutting machine body is moved upward to reduce the cutting depth. 1 is an overall left side view of a portable cutting machine according to a first embodiment; FIG. This figure shows a state in which the cutting machine body is moved upward to reduce the cutting depth. 1 is an overall left side view of a portable cutting machine according to a first embodiment; FIG. This figure shows the state in which the battery pack is removed. FIG. 3 is a perspective view of a single battery pack; It is an overall left side view of a portable cutting machine according to a second embodiment. It is an overall left side view of a portable cutting machine according to a second embodiment. This figure shows the state in which the battery pack is removed. It is the whole portable cutting machine right side view concerning a 3rd embodiment. 13 is an overall plan view of the portable cutting machine according to the third embodiment, viewed from the direction of arrow (XIII) in FIG. 12. FIG. FIG. 11 is a vertical cross-sectional view of a portable cutting machine according to a third embodiment; This figure is a cross-sectional view taken along the line (XIV)-(XIV) in FIG. 14 is a left side view of the portable cutting machine according to the third embodiment, viewed from the direction of arrow (XV) in FIG. 13. FIG. It is the figure which looked at the internal structure of the portable cutting machine which concerns on 3rd Embodiment from the left side. FIG. 11 is a cross-sectional view of a portable cutting machine according to a third embodiment; This figure is a cross-sectional view taken along the line (XVII)-(XVII) in FIG. It is an overall perspective view of a portable cutting machine according to a third embodiment. This figure shows a state viewed from the direction of the arrow (XVIII) in FIG. 15, which is the surface direction of the ground surface for inverted standing. It is an overall perspective view of a portable cutting machine according to a third embodiment. This figure shows a state in which the grounding surface is grounded and inverted.

Next, embodiments of the present invention will be described with reference to FIGS. 1 to 19. FIG. 1 to 5 show a portable cutting machine 1 according to a first embodiment. The portable cutting machine 1 of the first embodiment is a portable cutting machine called a portable circular saw. It has a cutting machine body 10 supported on.

In FIGS. 1 and 2, the user is positioned on the left side of the portable cutter 1, and the cutting proceeds by moving the portable cutter 1 to the right in FIGS. In the following description, the direction in which cutting progresses is defined as the front side, and the user side is defined as the rear side to specify the front-rear direction of members and structures. Also, the horizontal direction is specified based on the user.

The cutting machine main body 10 includes a circular cutting tool 13 called a chip saw that rotates using an electric motor 12 as a driving source. The upper side of the cutting tool 13 is covered with a fixed cover 14. - 特許庁The lower side of the cutting tool 13 protrudes from the lower side of the base 2 . The lower part of the base 2 protruding downward is cut into the material W to be cut.

A movable cover 15 covers the peripheral edge (cutting edge) on the lower side of the cutting tool 13 protruding to the lower surface side of the base 2 . The movable cover 15 is rotatably supported with respect to the fixed cover 14 about the center of rotation 13 a of the cutting tool 13 . When the movable cover 15 is rotated clockwise in the figure, it is opened to expose the peripheral edge of the cutting tool 13 . When the movable cover 15 is rotated counterclockwise in the figure, it is closed to cover the edge of the cutting tool 13 . The movable cover 15 is biased in the closing direction by a tension spring (not shown).

A reduction gear portion 16 is provided on the left side of the fixed cover 14 . A cylindrical motor housing 12a is attached to the left side of the reduction gear portion 16 so as to protrude leftward. The electric motor 12 is accommodated in the motor housing 12a. The electric motor 12 is mounted with the motor axis M extending in the left-right direction. As shown in FIG. 4, an intake port 12b for introducing outside air (motor cooling air) is provided on the left end surface of the motor housing 12a on the side opposite to the cutting tool. The electric motor 12 is cooled by outside air introduced from the intake port 12b.

A battery mounting base portion 17 is provided to extend rearward from the rear portion of the motor housing 12a. The battery mounting base portion 17 has a generally flat plate shape, and is provided in a direction in which the plate thickness direction thereof extends along the left-right direction. A loop-shaped handle portion 20 is provided between the vicinity of the joint between the motor housing 12 a and the reduction gear portion 16 and the vicinity of the rear upper surface of the battery mounting base portion 17 .

The handle portion 20 includes an upright portion 21 extending upward from the vicinity of the joint between the motor housing 12a and the reduction gear portion 16, and a grip portion 22 extending downward from the upper portion of the upright portion 21 to the rear. The rear portion of the grip portion 22 is coupled to the vicinity of the rear upper surface of the battery mounting base portion 17 . A trigger-type switch lever 23 is provided on the lower surface near the connecting portion between the standing portion 21 and the grip portion 22 . The user can grip the grip portion 22 to move the portable cutting machine 1 and pull the switch lever 23 to start the electric motor 12 .

The cutting machine main body 10 is supported so as to be vertically swingable with respect to the base 2 via a vertically swinging support shaft 18 . 6 and 7 show a state in which the cutting machine main body 10 is displaced to the upper movement end about the vertical swing support shaft 18. FIG. By changing the vertical swing position of the cutting machine body 10 with respect to the base 2, the amount of protrusion of the cutting tool 13 toward the lower surface side of the base 2 can be changed, thereby adjusting the depth of cut into the material W to be cut. be able to. FIG. 1 shows a state in which the cutting machine main body 10 is positioned at the lower movement end with respect to the base 2 and the cutting depth is set to the maximum.

The vertical swing position of the cutting machine main body 10 with respect to the base 2 is fixed by rotating a fixing lever 19 provided on the rear side toward the fixed side. An arc-shaped depth guide 25 is provided on the upper surface of the rear side of the base 2 so as to stand upward. The vertical swing motion of the rear portion of the cutting machine main body 10 is guided by the depth guide 25 .

The cutting machine main body 10 is supported so as to be tiltable to the left and right with respect to the base 2 via front and rear left and right tilting support shafts 26 and 27 . The front left and right tilting support shaft 26 is shown in FIG. 3, and the rear left and right tilting support shaft 27 is shown in FIG. The front and rear left and right tilt support shafts 26 and 27 are arranged coaxially with each other. By adjusting the horizontal tilting position of the cutting machine body 10 via the horizontal tilting support shafts 26 and 27, the cutting tool 13 can obliquely cut the material W to perform oblique cutting.

As described above, the battery mounting base portion 17 is provided behind the motor housing 12a. As shown in FIG. 2, the battery mounting base portion 17 is provided on the side opposite to the fixed cover 14 with respect to the handle portion 20 (the side opposite to the cutting tool). A battery mounting portion 30 is provided on the left side surface of the battery mounting base portion 17 . One battery pack 31 can be attached to the battery attachment portion 30 .

The battery pack 31 is a lithium-ion battery with an output of 18V, and can be used repeatedly by removing it from the battery mounting portion 30 and charging it with a separately prepared charger. FIG. 9 shows the removed battery pack 31 . The battery pack 31 has a substantially rectangular parallelepiped shape with a length L in the front-rear direction, a width D in the left-right direction, and a height H in the up-down direction. The dimensions in each direction have a magnitude relationship of length dimension L>width dimension D>height dimension H, as is the case with this type of battery pack. That is, the length dimension L is the longest dimension because the rail portion is lengthened in order to maintain a firm mounting state. The width dimension D is the second longest dimension for the convenience of arranging the terminals and the rail part side by side. Although the height dimension H is relatively flexible, it is the shortest length in this embodiment.

The battery pack 31 has six surfaces, namely front and rear, left and right, and upper and lower surfaces, and the upper surface in the drawing serves as a connection surface 31b to the battery mounting portion 30 . A connecting surface 31b of the battery pack 31 is provided with a pair of left and right rail portions 31d extending in the front-rear direction. Positive and negative terminal receiving portions 31e and 31f are provided between the left and right rail portions 31d. A signal terminal receiving portion 31g is provided between the positive and negative terminal receiving portions 31e and 31f.

A lock claw 31c is provided behind the connection surface 31b of the battery pack 31 . The lock claw 31c is spring-biased to the projecting side (locking side). An unlock button 31a is provided behind the lock claw 31c. The unlock button 31a is not visible in FIG. When the unlocking button 31a is pushed down, the lock claw 31c is pulled down to the unlocking side against the biasing force of the spring. In addition, in FIG. 9 showing the battery pack 31 alone, each direction of front, back, left, right, and up and down is also used in a unique manner. The connecting surface 31b is the upper surface, the attachment direction is the front side, and the removal direction is the rear side. Also, left and right are used as left and right directions toward the mounting direction.

FIG. 8 shows the battery mounting portion 30 with the battery pack 31 removed. The battery mounting portion 30 is provided with a pair of upper and lower rail receiving portions 30a. The upper and lower rail receiving portions 30a are provided parallel to each other and extend in the front-rear direction. By sliding the battery pack 31 forward and backward while the rail portions 31d are engaged with the upper and lower rail receiving portions 30a, the battery pack 31 can be attached to and detached from the battery attachment portion 30. FIG. As indicated by the white arrow in FIG. 8, the battery pack 31 can be slid forward and attached to the battery attachment portion 30 . Conversely, the battery pack 31 can be slid rearward and removed from the battery mounting portion 30 .

Positive and negative power supply terminals 30b and 30c are provided between the upper and lower rail receiving portions 30a. One signal terminal 30d is provided between the positive and negative power supply terminals 30b and 30c. A claw engaging portion 30 e for engaging a lock claw 31 c of the battery pack 31 is provided at the rear portion of the battery mounting portion 30 . When the battery pack 31 is slid forward and attached to the battery attachment portion 30 , the lock claw 31 c engages the claw engagement portion 30 e to lock the battery pack 31 attached to the battery attachment portion 30 . As shown in FIG. 1, an unlock button 31a is provided at the rear of the battery pack 31. As shown in FIG. When the unlock button 31a is pressed down, the lock claw 31c is pulled in and disengaged from the claw engaging portion 30e, whereby the battery pack 31 can be slid backward and removed from the battery mounting portion 30. .

The battery pack 31 is attached to the battery attachment portion 30 by sliding it forward with the connecting surface 31b on its upper surface directed to the right side (sideways attitude). Therefore, when the battery pack 31 is attached, the width dimension D is the vertical dimension as shown in FIG. 1, the length dimension L is the longitudinal dimension as shown in FIG. 2, and the height dimension. It is in a sideways posture with H being the dimension in the left-right direction.

As shown in FIGS. 2 and 3, the battery pack 31 installed in a sideways position is appropriately positioned in the lateral direction of the battery mounting portion 30 so that the battery pack 31 can be mounted within a range not protruding from the left end of the motor housing 12a on the side opposite to the cutting tool. It is Since the battery pack 31 is attached so as not to protrude leftward from the electric motor 12, the compactness of the portable cutting machine 1 in the horizontal direction (horizontal direction) is not impaired.

In addition, a dashed line indicates a type of battery pack having a large height dimension H. FIG. In this way, when a large battery pack is attached, it is only enlarged leftward, so that it does not interfere with the base and there is no need to increase the height of the handle. In this manner, two types of battery packs having different height dimensions H can be attached to the battery attachment portion 30 . In the present embodiment, the connection surface 31b is perpendicular to the base surface, but the same effect can be obtained if the connection surface 31b is inclined leftward or rightward at an angle of about 10° or less when viewed from the rear. can be played.

In addition, as shown in FIGS. 1, 4 and 5, the battery pack 31 is mounted in a range lower than the height H14 of the upper edge of the fixed cover 14 covering the cutting tool 13. Position is set properly. Since the attached battery pack 31 does not protrude upward from the upper edge of the fixed cover 14, the vertical compactness of the portable cutting machine 1 is ensured, and the portable cutting machine 1 has good operability. Secured.

Furthermore, the position of the battery mounting portion 30 in the height direction is appropriately set so that the battery pack 31 can be mounted in a range sufficiently below the handle portion 20 , particularly the grip portion 22 . The battery pack 31 does not get in the way when and in the state of gripping, and in this respect also good operability of the portable cutting machine 1 is ensured. As shown in FIGS. 1 and 4, the lower portion of the grip portion 22 approximately matches the height H14 of the upper edge of the fixed cover 14. As shown in FIG. The battery pack 31 is attached to a region below the grip portion 22 and below the height H14 of the upper edge of the fixed cover 14 .

In addition, the position of the battery mounting portion 30 in the front-rear direction is appropriately set so that the battery pack 31 can be mounted with the rear end protruding rearward from the rear end of the handle portion 20 . As a result, a large battery pack 31 can be attached by effectively utilizing the empty space behind the handle portion 20 .

According to the portable cutting machine 1 configured as described above, the battery pack 31 having the connection surface 31b on the upper surface is mounted with the upper surface facing sideways. The height dimension H is the projection dimension to the left in the attached state. Therefore, the battery pack 31 having a large height dimension H can be attached without increasing the position of the handle portion 20 in the height direction.

As described above, the height dimension H of the battery pack 31 is not affected by the height dimension H of the battery pack 31 as a result of the height dimension H protruding sideways from the handle portion 20 in the attached state. As a result, the large battery pack 31 can be attached without securing a large mounting space directly below the handle portion as in the conventional art. The degree of freedom in setting can be increased.

In addition, since the battery pack 31 attached in a sideways posture is attached in a range that does not protrude from the end (left end) of the motor housing 12a on the side opposite to the cutting tool, the lateral direction (horizontal direction) of the portable cutting machine 1 is compactness is not impaired.

Furthermore, since the battery pack 31 is attached within a range not exceeding the height H14 of the upper end edge of the fixed cover 14 covering the cutting tool 13, the vertical compactness of the portable cutting machine 1 is not impaired, thereby making it portable. The operability of the cutting machine 1 is not impaired.

In addition, since the battery pack 31 is configured to be attached to the handle portion 20 in a range lower than the grip portion 22 in terms of the position in the height direction, the battery pack 31 becomes an obstacle when gripping the grip portion 22. In addition, the battery pack 31 does not get in the way when it is gripped.

In addition, since the battery pack 31 is attached so as to protrude rearward from the handle portion 20, an empty space behind the handle portion 20 can be effectively utilized.

10 and 11 show a portable cutting machine 40 according to a second embodiment. The portable cutting machine 40 according to the second embodiment differs from the first embodiment in the sliding direction for attaching and detaching the battery pack 31 to and from the battery attachment portion 41 . The same symbols are used for the same members and configurations as in the first embodiment, and the description thereof is omitted.

The sliding direction for attaching and detaching the battery attachment portion 30 according to the first embodiment is as shown in FIG. is set in a direction parallel to the bottom surface of the On the other hand, the sliding direction for attaching and detaching the battery attachment portion 41 according to the second embodiment is at an angle with respect to the lower surface of the base 2 with the cut depth set to the maximum as shown in FIG. It is set in the direction of tilting forward at α (the direction of downward movement toward the front, the direction of displacing the rear side upward). The forward tilt angle α is set to about 5°. This forward inclination angle α can be changed, for example, to a larger angle within a range that does not hinder the gripability of the handle portion 20 . For example, the forward tilt angle α can be set in the range of about 10° to 30° to give priority to the operability of attachment and detachment.

Since the sliding direction for attaching and detaching the battery pack 31 is tilted forward with respect to the lower surface of the base 2, the twist of the wrist of the hand holding the battery pack 31 during attachment and detachment is prevented. The battery pack 31 can be slid in the direction of attachment or detachment with a small, comfortable posture and with a smaller force, and the operability of attachment and detachment can be improved in these respects.

Also, in the battery mounting structure according to the second embodiment, since the battery pack 31 is mounted on the battery mounting portion 41 provided on the left side of the handle portion 20 in a sideways posture, the height dimension H is large. The battery pack 31 can be attached without interfering with the gripping ability of the handle portion, which is the same as in the first embodiment.

12-15 show a portable cutter 50 of a third embodiment. The portable cutting machine 50 according to the third embodiment is characterized mainly by the location of the controller 52 for controlling the operation of the electric motor 60 . The same configuration is provided for the mounting form in which the connection surface 31b of the battery pack 31 is directed to the side (sideways position). In addition, members and configurations similar to those of the first and second embodiments are denoted by the same reference numerals, and descriptions thereof are omitted. As indicated by the dashed line in FIG. 13, in the portable cutting machine 50 according to the third embodiment as well, two types of battery packs 31 having different heights H can be attached to the battery attachment portion 30 in a sideways posture. can.

A portable cutting machine 50 according to the third embodiment has a brushless motor as an electric motor 60 . The electric motor 60 is housed in a cylindrical motor housing 61 . The motor housing 61 is coupled to the reduction gear portion 16 provided on the left side of the fixed cover 14 as in the first embodiment. Therefore, the electric motor 60 is arranged along a motor axis line M extending in the left-right direction.

14 and 17 show details of the electric motor 60. FIG. The electric motor 60 includes a cylindrical stator 60a fixed along the inner periphery of the motor housing 61 and a rotor 60b rotatably supported on the inner periphery of the stator 60a. The rotor 60b is integrated with the motor shaft 60c. The motor shaft 60c is rotatably supported via a right bearing 60d and a left bearing 60e. The rotation axis of the motor shaft 60c corresponds to the motor axis M. As shown in FIG. The right bearing 60 d is held by the reduction gear portion 16 . The left bearing 60 e is held at the left end of the motor housing 61 .

A disk-shaped sensor substrate 60f is attached along the left end of the stator 60a. The rotational position of the rotor 60b is detected by the sensor substrate 60f. A cooling fan 60g is attached to the motor shaft 60c between the rotor 60b and the right bearing 60d. The cooling fan 60g rotates integrally with the motor shaft 60c.

An intake port 61a for introducing motor cooling air is provided on the left end surface of the motor housing 61 on the side opposite to the cutting tool. When the electric motor 60 is activated and the cooling fan 60g rotates, external air is introduced from the air intake port 61a of the motor housing 61. As shown in FIG. The electric motor 60 is cooled by outside air introduced from the intake port 61a. The flow of the motor cooling air is indicated by thick filled arrows in FIGS. 14 and 17 . The motor cooling air that has flowed rightward from the intake port 61a of the motor housing 61 flows through the vent port 62 into the controller housing 51, which will be described below. The air vent 62 is provided on the side of the cooling fan 60g and on the front side of the right end of the motor housing 61 .

A portable cutting machine 50 according to the third embodiment has a controller housing 51 in front of a motor housing 61 . A controller 52 is accommodated in the controller housing 51 . As shown in FIGS. 16 and 17, the controller 52 is made of die-cast aluminum and has a shallow bottom rectangular case 52a. It has a generally flat plate shape.

The control board 52b of the controller 52 includes a control circuit consisting of a microcomputer for transmitting control signals based on the rotational position information of the rotor 60b detected by the sensor board 60f, and an electric motor control circuit based on the control signals received from this control circuit. 60, and an auto-stop circuit that cuts off the power supply to the electric motor 60 so as not to over-discharge or over-current according to the detection result of the state of the battery pack 31. ing.

The controller 52 is accommodated in the controller housing 51 in a forward tilting posture in which the lower side is tilted forward as shown. Therefore, as shown in FIG. 15, the controller housing 51 is also disposed with its lower side inclined in the direction of forward displacement, and its upper side is coupled to the front portion of the motor housing 61 . The vent 62 described above is provided at the joint between the upper portion of the controller housing 51 and the front portion of the motor housing 61 . The inside of the motor housing 61 and the inside of the controller housing 51 are communicated with each other through the air vent 62 .

As indicated by solid arrows in FIGS. 14 and 17, the motor cooling air introduced into the motor housing 61 by the cooling fan 60g of the electric motor 60 flows into the controller housing 51 through the air vent 62 and the controller 52 is cooled. A heat source such as an FET (field effect transistor) mounted on the control board 52b of the controller 52 is cooled by the cooling air that has flowed in. FIG. Part of the motor cooling air does not flow into the controller housing 51, and part of it passes through the blower duct 24 extending forward adjacently along the motor-side vertical wall portion of the fixed cover 14, and flows into the fixed cover. 14 as a blower, and the other portion passes through the reduction gear portion 16 and is discharged into the fixed cover 14 .

The reduction gear portion 16 accommodates the gear train 63 in the gear housing 16 a and has the function of reducing the rotational output of the electric motor 60 in two stages and transmitting the reduced output to the output shaft 68 . Details of the reduction gear portion 16 are shown in FIG. The right end side of the motor shaft 60c is inserted into the gear housing 16a. A drive gear portion 60h is provided at the right end of the motor shaft 60c. The drive gear portion 60 h is meshed with the first driven gear 64 . The first driven gear 64 is provided on the left side of the intermediate shaft 65 . The intermediate shaft 65 is rotatably supported by the gear housing 16a via a right bearing 65a and a left bearing 65b. A second driven gear 66 is provided on the intermediate shaft 65 on the right side of the first driven gear 64 . The first and second driven gears 64 and 66 rotate together with the intermediate shaft 65 .

The second driven gear 66 is meshed with the output gear 67 . An output gear 67 is provided integrally with the output shaft 68 . The output shaft 68 is rotatably supported below the gear housing 16a via a right bearing 68a and a left bearing 68b. The right end side of the output shaft 68 protrudes into the fixed cover 14 . A cutting tool 13 is attached to the right end of the output shaft 68 . The cutting tool 13 is attached to the shaft end of the output shaft 68 by tightening the cutting tool fixing screw 69 while being sandwiched between the outer flange 69a and the inner flange 69b.

As shown in FIG. 12, the intermediate shaft 65 is displaced rearward by a distance d with respect to a line connecting the rotational axis of the motor shaft 60c (motor axis M) and the rotational axis of the output shaft 68 (the center of rotation of the cutting tool 13). are placed. As a result, the distance j between the motor shaft 60c and the output shaft 68 in the vertical direction is reduced, and the motor axis line M can be lowered, so that the product can be made compact.

As shown in FIGS. 13 and 15, the front portion of the controller housing 51 is provided with an electric material accommodating portion 53 . An accommodation space 53 a that bulges forward of the controller 52 is secured by the electric material accommodation portion 53 . As shown in FIG. 16, various electrical components such as FETs, capacitors 53b, and wiring 53c are accommodated in a storage space 53a secured by the electrical material storage portion 53. As shown in FIG. As shown in FIG. 13, a switching button 28 for switching the operating state of the portable cutting machine 50 is provided on the front surface of the handle portion 20 . Each time the switch button 28 is pressed, it is possible to switch between a "constant rotation mode" and an "automatic transmission mode" in which the speed is automatically changed from high rotation and low torque to low rotation and high torque in accordance with an increase in load. It is possible. Two lamps are provided on the front surface adjacent to the switching button 28 to indicate the mode switching state. These two lamps are arranged on a straight line where the operator visually recognizes the black lines, so that visibility is excellent.

A ground plane 51 a for three-point inversion is provided on the left upper portion of the controller housing 51 . This ground plane 51a is shown surrounded by a thick line and hatched in a grid pattern in FIG. The ground contact surface 51a is a front inclined surface that is inclined downward forward and a left inclined surface that is inclined downward to the left. Therefore, the ground contact surface 51a is a flat inclined surface that descends forward and leftward. In FIG. 18 viewed in the direction of the arrow (XVIII) in FIG. 15, the portable cutting machine 50 is shown in a state of being viewed from the plane direction of the inverted ground plane 51a. The arrow (XVIII) direction in FIG. 15 substantially matches the extending direction (plane direction) of the controller 51 . Accordingly, the ground contact surface 51a is a flat surface that is bent and inclined along two straight lines (ridge lines) substantially parallel to the extending direction of the controller 51. As shown in FIG.

As shown in FIG. 19, the grounding surface 51a provided on the controller housing 51, the left front corner portion 2a of the base 2, and the front end portion 21a of the standing portion 21 of the handle portion 20 are grounded on the installation surface F. Therefore, the portable cutting machine 50 can be stably installed in an upside-down inverted posture. As shown in the figure, in this inverted posture, the lower surface of the base 2 faces upward, and the cutting tool 13 is projected upward with the movable cover 15 covered.

Further, in this inverted posture, the grip portion 22 of the handle portion 20 is positioned at an appropriate distance upward from the installation surface F. As shown in FIG. For this reason, for example, when the operator temporarily suspends the cutting work on the installation surface F, the portable cutting machine 50 can be installed in an upside-down posture while holding the holding part 22. can.

In this inverted posture, since the cutting tool 13 is directed upward, there is no risk of damaging the installation surface F, and the holding part 22 can be kept on standby at a position where it can be easily grasped again, so that the work can be easily interrupted or continued. can be done. Thus, by providing the controller housing 51 with the ground surface 51a for three-point inversion, for example, the portable cutting machine 50 can be stably installed in an upside-down inverted posture. Workability of the portable cutting machine 50 is enhanced.

According to the portable cutting machine 50 according to the third embodiment configured as described above, the battery pack 31 is mounted with its upper surface (connecting surface 31b) facing sideways, and thus, it is the same as in the first embodiment. It is possible to obtain the effects of

Further, according to the portable cutting machine 50 of the third embodiment, the controller 52 for controlling the operation of the electric motor 60 is compactly arranged in the dead space in front of the motor housing 61 .

In particular, the controller 52 is housed in the controller housing 51 in a forward tilted posture, and the upper portion of the controller housing 51 is connected to the motor housing 61 . Therefore, the controller 52 is arranged compactly in the height direction, and the rigidity of the controller housing 51 is increased while the height dimension of the controller housing 51 is suppressed.

Further, according to the portable cutting machine 50 of the third embodiment, the electric material accommodating portion 53 is provided in front of the controller housing 51 . The upper portion of the electrical material housing portion 53 is lower than the height of the controller housing 51 . Therefore, the empty space in front of the controller housing 51 can be used to compactly accommodate the electric material accommodating portions such as capacitors and wiring.

Furthermore, according to the portable cutting machine 50 according to the third embodiment, the end (left end) of the controller housing 51 on the side opposite to the cutting tool is flush with the end of the motor housing 61 on the side opposite to the cutting tool. . For this reason, both the end of the controller housing 51 and the end of the motor housing 61 are grounded, the cutting tool side of the portable cutting machine 50 is directed upward, and the cutting tool 13 is parallel to the installation surface F. It can be installed in a more stable posture, thereby making it easier to perform maintenance work such as blade replacement.

Further, according to the portable cutting machine 50 of the third embodiment, the front portion of the controller housing 51 is provided with a ground plane 51a for three-point inversion. The portable cutting machine 50 can be stably held in a three-point inverted posture in which the portable cutting machine 50 is almost turned upside down at three parts, namely, the ground surface 51a, the left front corner 2a of the base 2, and the front end 21a of the handle part 20. can be set. Since the portable cutting machine 50 can be stably installed in an inverted posture in this way, the installation surface can be prevented from being damaged when the work is temporarily interrupted. The cutting machine 50 can be put on standby temporarily, and the work can be resumed by easily grasping the gripping part 22. In this respect, the workability of the portable cutting machine 50 can be improved.

In the above-described third embodiment, the flat surface inclined between two straight lines (ridge lines) substantially parallel to the extending direction of the controller 51 is used as the ground surface 51a for three-point inversion. The surface that slopes in between can be the ground surface for 3-point handstand. In short, the corners and the like of the controller housing are partly cut off and used as the ground surface, so that the three-point inversion can be made possible without additional setting of legs and the like. Although the left front corner portion 2a of the base 2 and the front end portion 21a of the handle portion 20 are grounded for the three-point inversion, the other two portions may be grounded in addition to the grounding surface 51a. .

Further modifications can be added to the portable cutting machines 1, 40, 50 of the first to third embodiments described above. Instead of a portable cutting machine using a tipped saw as a cutting tool, for example, a cutting machine equipped with a rotating cutting tool such as a saw blade or a diamond wheel, or a reciprocating saw or jigsaw that reciprocates a cutting tool. 52 configurations can be applied as well.

W... Cutting material 1... Portable cutting machine (first embodiment)
2 Base 2a Left front corner 10 Cutting machine body 12 Electric motor 12a Motor housing 12b Suction port M Motor axis 13 Cutting tool 13a Rotation center 14 Fixed cover H14 Fixed cover Height of the upper edge of 14 15 Movable cover 16 Reduction gear 17 Battery mounting pedestal 18 Vertically swinging support shaft 19 Fixed lever 20 Handle 21 Standing portion 21a Front end 22 Gripping portion 23... Switch lever 24... Blower duct 25... Depth guides 26, 27... Left/right tilt support shaft 28... Switching button 30... Battery attachment part 30a... Rail receiving part, 30b, 30c... Positive and negative power supply terminals, 30d... Signal terminal 30e ... claw engaging portion 31 ... battery pack (length dimension L, width dimension D, height dimension H)
31a...unlock button, 31b...connection surface, 31c...lock claw, 31d...rail parts 31e, 31f...positive and negative terminal receiving parts, 31g...signal terminal receiving part 40...portable cutting machine (second embodiment)
41... Battery mounting portion 50... Portable cutting machine (third embodiment)
51 Controller housing 51a Ground plane 52 Controller 52a Case 52b Control board 53 Electronic material housing portion 53a Housing space 53b Capacitor, wiring 53c
60... Electric motor 60a... Stator 60b... Rotor 60c... Motor shaft 60d, 60e... Bearing 60f... Sensor board 60g... Cooling fan 60h... Driving gear unit 61... Motor housing 61a... Intake port 62... Air vent 63 Gear train 64 First driven gear 65 Intermediate shafts 65a, 65b Bearing 66 Second driven gear 67 Output gear 68 Output shafts 68a, 68b Bearing 69 Cutting tool fixing screw 69a Outer flange, 69b Inner flange F…Installation surface

Claims (9)

A portable cutting machine comprising a base to be brought into contact with the upper surface of a material to be cut, and a cutting machine body supported on the upper surface of the base, wherein a cutting tool of the cutting machine body protrudes from the lower surface side of the base to cut into the material to be cut. and
The cutting machine main body includes an electric motor as a driving source for operating the cutting tool, and a handle held by a user,
A battery attachment part for attaching a battery pack having a connection surface on the upper surface is provided on the side part on the side opposite to the cutting tool with respect to the handle part,
The battery pack can be attached by sliding it in a direction orthogonal to the left-right direction with respect to the battery attachment portion with the connection surface facing laterally,
In the attached state, the battery pack
Regarding the position in the height direction, the handle extends in a direction orthogonal to the left-right direction when the cutting depth, which is the amount of protrusion of the cutting tool toward the lower surface of the base, is maximized. located below the entire grip of the part,
Further, the portable cutting machine is configured such that the entire battery pack is positioned on the side opposite to the cutting tool with respect to the center of the handle portion in the lateral direction. 2. The portable cutting machine according to claim 1, wherein a motor housing for accommodating the electric motor is provided so as to protrude sideways from a side of the handle portion opposite to the cutting tool,
Two types of battery packs with different height dimensions can be exchanged and attached to the battery attachment portion, and both battery packs can be attached within a range not exceeding the end of the motor housing on the side opposite to the cutting tool. portable cutting machine. 3. The portable cutting machine according to claim 1, wherein said battery pack is mounted in a range lower than an upper edge of a cover covering said cutting tool with respect to a position in the height direction. The portable cutting machine according to any one of claims 1 to 3, wherein the battery pack is mounted with its rear end positioned rearwardly of the rear end of the handle portion with respect to the position in the front-rear direction. Configured portable cutting machine. 5. The portable cutting machine according to any one of claims 1 to 4, wherein the battery pack is attached to the battery attachment portion by sliding in a forward tilting direction toward the front where the cutting progresses. Portable cutting machine. A portable cutting machine comprising a base to be brought into contact with a material to be cut, and a cutting machine body supported on the upper surface of the base. hand,
The cutting machine main body includes an electric motor as a driving source for operating the cutting tool, and a handle held by a user,
A battery attachment part for attaching a battery pack having a connection surface on the upper surface is provided on the side part on the side opposite to the cutting tool with respect to the handle part,
The battery pack can be slidably attached to the battery attachment part with the connection surface facing laterally,
disposing a controller for controlling the operation of the electric motor in front of a motor housing that houses the electric motor;
The controller is housed in a controller housing in a forward tilted posture, and the upper portion of the controller housing is connected to the motor housing. 7. The portable cutting machine according to claim 6, further comprising an electric material accommodating portion provided in front of said controller housing, the upper portion of which is lower than the height of said controller housing in the height direction. 8. The portable cutting machine according to claim 6, wherein the end of the controller housing opposite the cutting tool is flush with the end of the motor housing opposite the cutting tool. 9. The portable cutting machine according to any one of claims 6 to 8, wherein the portable cutting machine can be installed in an inverted posture at three parts of the base, the handle portion and the controller housing. A portable cutting machine with a ground on said controller housing.

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